Interaction | Reaction | Process     Data Page

When excess dilute ammonia solution is added to a solution of very pale violet (or sometimes yellowish) hexaaquairon(II) ion, the complex cation acts as a Brønsted acid and loses three protons giving a rust-brown precipitate of the neutral complex triaaquatrihydroxyiron(III) and three ammonium ions. (Only three moles of ammonia are used.)

[Fe(H2O)6]3+

  +  
6
NH3(aq)
         

Fe(H2O)3(OH)3
Fe(OH)3

  +  
3
[NH4]+
  +  
3
NH3
Reactant Page Go To Go To
Hexaaquairon(III) ion     Reactions Using    Reactions Forming
Ammonia, aqueous     Reactions Using    Reactions Forming
Triaquatrihydroxyiron(III)     Reactions Using    Reactions Forming
Ammonium ion     Reactions Using    Reactions Forming
Ammonia     Reactions Using    Reactions Forming

Interaction, Reaction, Process defined as:
British A-Level Chemistry: A2
Precipitation
Proton transfer: Brønsted reaction

© Mark R. Leach 1999 –


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